Electrical warp stop motion for looms



17, 1931 w. H. WAKEFIELD 1,793,147

ELECTRICAL WARP STOP MOTION FOR-LOOMS j Filed June 27, 1930 2 Sheets-Sheet 1 MW M Feb. 17. 1931. w. H. WAKEFIELD 1,793,147

ELECTRICAL WARP STOP MOTION FOR LOOMS Filed June 27, 1930 2 Sheets-Sheet 2 III I,

A 77'UFPNE Y5 a? I .ZM/EN TUE MLTERHWAKEF/ELU Patented Feb. 17, 1931 UNITED STATES PATENT OFFICE WALTER H. VTAKEFIELD, OF WORCESTER MASSACHUSETTS, ASSIGNOR TO QROIVIPTON 8: KNOWLES LOOM WORKS, OF WORCESTER, MASSACHUSETTS, CORPORATION OF MASSACHUSETTS ELECTRICAL WARP STOP FICTION FOR LOOMS Applieation filed June 27, 1930. Serial no. 464,381.

This invention relates to improvements in electrical warp stop motions and it is the general object of the invention to simplify the construction of motions built up of similar units and at the same time permit enlargement of a comparatively small motion by the addition of other units.

It has been customary for some time to mount a mechanical warp stop motion on an angle bar having a part parallel to the lay to extend into a vertically adjustable post and having a threaded part parallel to the warp to have mounted thereon the head or other holding structure for the parts which cooperate with the drop Wires. This angle iron affords a universal adjustment within certain limits and it is an important object of my invention to mount electric contact bars directly on this angle iron and hold the bars in spaced relation ,by means of sleeves or similar devices strung along the rod.

It is customary to employ at least twosocalled separator bars one function of which is to determine the plane of the warpthreads adjacent the warp stop motion withrespect to the detector bar so that the latter may be properly related relatively to the drop wires. It is a further object of my invention to provide means for supporting the separator bars at varying distances apart, depending upon the width of the warp stop motion With these and other objects in view which will appear as the description proceeds, my invention resides in the combination and arrangement of parts hereinafter described and set forth in the claims.

In the accompanying drawings wherein a convenient embodiment of my invention is set forth, a

Fig. 1 is a vertlcal transverse sect on a through a warp stop motion made according to my present invention,

Fig. 2 is a top planview taken in the direction of arrow 2, Fig. 1,

Fig. 3 is a perspective .VleW showingjone' the separator support end of the bars With removed, H 7

'Fig. 4: is an enlarged view similar to a portion of Fig. 1,' Fig. 5. is a front elevationtakeniin the diinsulating material 27.

rection of arrow 5, Fig. 4, the supporting bar being shown in section,

Fig. 6 is a front elevation of one of the bars, and

Fig. 7 is a perspective view of that end of one of the bars opposite the part shown in Fig. 3 and illustrating the manner of affording connection for the insulated electrode.

As shown in Fig. 1' the invention is applied to a loom, the frame 10 of which supports bracket 11 having mounted therein an upright vertically adjustable post 12' held in position by screw 13. A head or hearing 14 on the post receives a short end 15 of a supporting angle iron 16 which isheld in adjusted angular position with respect to the post by meansof a set screw 17. The angle iron has a threaded portion 18 extending substantially parallel to the warp.

spaced separator bars 19 define the line of the warp N and a plurality of electric contact or detector bars 20 located above the separator bars cooperate with dropwires B. Each detector bar has an outside inclosing grounded sheath 21 having a vertical wall 22 crimped as at 23 and having the upper and lower edges bent to lie parallel to the wall 22 as at 2% and 25, respectively. Located be ween the bent edges is a live electrode 26 spaced from the grounded electrode 21 by The drop wire is provided with a slot 28jthrough which one of the detector bars extends and said drop wire has projections 29 which co-act with the rib 28 and the live elect-rode to close a circuit not 5 shown when the drop wire 18 in fallen posithe same as that shown in co-pending application Ser. No. 350A01 filed Payne.

In carrying my invention into eifcct I provide means for supporting the detector bars directly to the threaded, portions 18 of the angle irons. It would bepossible to effect direct connection between the angle irons and either of. the electrodes, but as shown herein I have chosen to support the contact bars through the outside or grounded electrodes.

Accordingly, these electrodes extend beyond the adjacent ends of the live electrode 26 and the insulating material 27 and said projecting portion, designated herein at 40, is provided with a longitudinal slot all which is preferably at least as wide as the rib and of sntlicient size to receive the threaoed end 18 I of one of the angle bars. Located between each of the bars and mounted. on the end 18 are spacing sleeves t2. the diameter of each of which is preferally not in excess ot the length oi the slot 41. so that said sleeves may have direct contact with the vertical portions of the wall 22 without being spaced from the latter by the rib. Nuts 43 and 14 on the threaded part 18 of the angle irons ailord means for clamping the several shelves and detector bars together in fixed spaced relation. The shelves are all preferably oi the same length so that the detector bars are unitormly spaced.

In the form of the invention set forth herein both ends of each detector bar are formed as suggested in F 3 so that the ends of the live electrode terminate a short distance from the ends of, the grounded electrode. In order to establish electric connection with said live electrode, I provide each of the same with an ear at one e d hereof to which the wire 46 may be attached to establish electrical connection between all of the live electrodes and the external circuit referred to but not shown. The manner of elect ically connecting the live electrodes is of no particular consequence and if desir d the method employed in co-pending application Serial No. 464:,358 filed by Payne may be used. In the method set forth herein it will be necessary slip the detector bar through the aligning slots of the drop wi -es from one side only because of the pro i ear 4:5, whereas if the form of connec.;ion shown in the last mentioned applicad this limi ation will not be present.

T rater bars 19 are suioortcd b i H l l 1 mea of rour hangers, two at each eno. of the motion, each hanger 50 having a bearin g portion 51 through which the threaded part of the angle iron pass s. The bearing may be locked either between the adjacent nut and a corresponding sleeve. or between one or" the end sleeves and the adjacent grounded electrode. The depending portion of each hanger is provided with horizontal support 52 on which the separator bar rests. A bolt 53 passes through each pair of hangers and the corresponding separator bars and has strung therealong a plurality of sleeves 54 which are dependent in number upon the number of sleeves l2 employed. As shown in Fig. 5 the lower part of each hanger may be wideneo as at 55 and a screw or other securing device 56 spaced from and in addition to the bolt 53 may be passed between each separator bar and its hanger so as to provide a more rigid construction.

If it be desired to increase the number of detector bars the outside nuts l will be removed and the nuts 57 will be removed from the bolts 53, after which the desired number of additional contactbars a d spacers or sleeves -12 can he slipped over the rods 18. The new bars may be clamped in position by replacement of the nut 44:. In similar manner, additional sleeves can be strung along the bolts 53 so that the rcarmost hanger will place the rear separator bar 19 in position to locate the warp properly with respect to all ot the drop wires.

From the foregoing it will be seen that I have provided a simple means for supporting the contact bars of electrical warp stop motions, provision being made for expanding the width of the motion to meet the demands of a liner warp. It will also be seen that provision is made for moving the separator bars so that they can locate the warp properly for all of the detector bars. Furthermore, it will be seen that the specific form of the end of the detector bar permits the sleeves 42 to be clamped directly against the vertical walls of the grounded electrodes.

Having thus described my invention it will be seen that changes and modifications may be made therein by those skilled in the art without departing from the spirit and scope of the invention and I do not wish to be limited to the details herein disclosed, but what I claim is:

1. In a warp stop motion, a plurality of electric contact bars, an electrode of one p0 larity for each bar, an electrode of the opposite polarity for each bar, a longitudinal supporting member passing through the electrodes of one polarity and spaced from the electrodes of the other polarity, and separate spacers between adjacent bars and surround ing the supporting member to hold the several bars in spaced relation.

2. In a warp stop motion, a plurality of electric contact bars, said'bars having a set of grounded and another set of live electrodes, a supporting member extending through one set of electr dos and insulated from the other set, and current conducting spacers on said member located between the bars and holding the latter in spaced relation.

3. In an electrical warp stop motion, a plurality of electric contact bars, each bar having a live electrode and a grounded electrode, a supporting member passing through each of the grounded electrodes, spacers on the member between the grounded electrodes, and means to hold the bars and spacers clamped together on the member to hold said bars in-spaced relation. 7

4. In an electrical warp stop motion, a plurality of electric contact bars, each bar having a live electrode and a grounded electrode, a supporting member passing through each of the grounded electrodes, spacers on the member between the grounded electrodes, and means to hold the bars and spacers clamped together on the member to hold said bars in spaced relation, each of said grounded electrodes having a longitudinally extending rib to co-act with a fallen drop wire, each spacer being separated from the rib and having direct contact with the body of the grounded electrode.

5. In a warp stop motion having provision for supporting a varying number of detector bars, spaced separator bars below the detector bars, and means to hold the separator bars in spaced relation a distance apart depending upon the number of detector bars present, said means including a longitudithe support intermediate and in electrical contact with the electrodes through a portion of which the support passes, and means to hold the spacers and electrodes together on the support as a unified structure.

7. In a warp stop motion, a threaded support substantially parallel to the warp threads, electric contact bars, live and grounded electrodes for each bar, the

grounded electrodes being mounted directly and means on the support to hold the pairs and spacers as a unitary structure in fixed position on the support.

In testimony whereof I have hereunto affixed my slgnature.

WALTER I-I. WAKEFIELD.

on the support, spacers on the support between the bars, and threaded clamping means on the support to hold the bars and spacers together on the support as a unified structure.

8. In an electrical warp stop motion, a threaded support extending substantially parallel to the warps, a set of electrodes of one polarity extending transversely of the warps, a second set of electrodes of the opposite polarity, one set of electrodes being mounted directly on the support and supporting the other set, the latter being out of electrical connection with the support, spacers between the electrodes of the set mounted directly on the support, and threaded clamping means on the support to hold the spacers and electrodes on the support as a unitary structure.

9. In a warp stop motion, a support eX-' tending substantially parallel to the warps, a set of dropwire engaging electrodes of one and mounted directly on the support, a second set of drop Wire engaging electrodes of the A polarity extending transversely of the warps opposite polarity out of contact with the sup- 7 I port, the electrodes being held together in pairs with an electrode of each polarity in each pair, spacers engaging the electrodes of one set to hold the pairs in spaced relation, 

